Observation-tube.



E. H. JOHNSON.

OBSERVATION T UBE. APPLICATION FILED MAR- 4. 1914.

' Patented. May-30,1916.

' 2 SHEETSSHEET I E, H. JOHNSON.

v OBSERVATION TUBE. APPLICATION. FILED MAR-4. I-QI I.

Patented May 30, 1916.

2 SHEETS-SHEET 2.

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B SERYATJEON-TUBE.

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. Toal l whoniit may concern I ,Be itfk own that L-Enwm' H. Johnson,

citizenYofj' the United States, residing; at

. Sayre,..infthe county of Bradford and State of Pennsylvania, have invented certain new and useful Improvements in Observation- 'lubes, .of.which the following is a specification. '1, p

This invention relates to what might be termed 'a sight or look-out-tube for use upon, street railway cars, locomotives, motor vehicles,"etc., the object thereof being to provide an improved device of this nature which may be manufactured at small cost,

may be readily attached to a'car vestibule or locomotive cab, and which willoperate :eficiently to prevent sight openings from becoming obscured or non=transparent by the accumulation ofv frost, ice, snow, rain or vapors thereon, the invention consisting in the construction, combination and arrangescent of parts hereinafter described "and claimed.

In describing my invention indetail ref erence will be had to the accompanying drawings wherein like characters denote like or corresponding parts'throughout the several views, and in which Figure 1 is a side elevation of a portion of a streetrailway car. illustrating the attachment'in longitudinal section; Fig. 2' is a rear QlBVittlOIl' of the attachment as illustrated in Fig. 1; Fig. 3 is a front elevation of the device; Fig. 4: is an enlarged fragmentary sectional view illustrating the manner in which the attachment is supported inits various adjusted positions; Fig. 5 is a rear end view. of a portion of a locomotive-cab illustrating the arrangement of a T modified form of lookout tubethereupon'; I longitudinal sectional, viewof the said modified form of tube, partly'in elevation; and Fig. 7 isv an e'n-v laiged longitudinal section of 'a pipe joint Fig. 6 is an e ilarged necessary to operation of the said modified device.

Before proceeding with the description Gill /he drawings, ll desire to call particular attention to the fact that While I have I Specification of Letters Patent;

Patented May an, rare;

Application filed March 4t, 1914. I Serial No. 822,889.

evolved my invention with reference to its use as an attachment for street railway cars, locomotives, and motor vehicles, the

same may be readily utilized as a sight tube or opening in connection with rolling stock generally.

Referring now to the drawings by numerals, 1 designates the car in connection with which the attachment is used, the said ata protecting element against driving snow or rain during forward movement of the car.

A substantially rectangular frame 7 is mounted in any suitable manner upon the inner end of the tubular extension 8, the said frame having a circular sight opening formed therein, said opening being closed by a glass panel or pane. 8 of a size corre 'sponding to the circumference of the tubular extension 3. lhe panel 8 and cone 2 are thereby made, in the adjustment of the latter, to move in unison.

As a means whereby the glass 8 may be conditioned or heated to prevent the accumulation of frost, moisture, sleet or other sight impeding elements, I provide a heater 9 in the nature of a coiled wire strand arranged to embrace theglass 8, said heater being supported in any suitable manner,

preferably by an annular flange 10 extendinginwardlyfrom the frame 7 as illustrated to advantage in Fig. 1 of the drawings. .At each side of the frame 7, and as a support therefor, ll provide a plate 11, the top edges of which are cut at an inclination to form a support for a'cover 12 extending inwardly from'the front of the carvestibule to overhang the opening in the frame. A second heater 13 is arranged beneath the cone 2 and supported therebeneath through the medium of an extension 1% of the cone, the

said heater being of the electric type as is 'structed is used.

Ears or lateral extensions 16 are provided, 1

also the heater 9, both being connected by suitable conductors 15 with the .circuitnecessary tothe operation of'the car 1 1n connection with which the device as at pr'esentcononeupon each side of the extension 3, preferably at diametrically Opposite po1nts,'t he said extensions fitting elongated openings or slots 17 within the respective sides of the uprights fi' of'the car vestibule, the. said slots providing a guide for the attachment in an adjusting operation, as well as a means whereby the said attachment maybe supported in the desired adjusted position. Thumb screws 18 are carried by the said extension 16, the thumb screw of each extension operating within slots 19 extending parallel with the slots 17 aforesaid, this ar= rangement as indicated in Fig. 4 providing for the looking or fastening ofthe tube or attachment in itsproperly adjusted position.

Referring now to the modification illus- 'trated in Figs. 5 to 7 inclusive, 1 designates the cab of an ordinary locomotive, 2 the boiler and 3' the window usually positioned at one side of the boiler and within the cab.

It is to provide for a clear lookout when the windows 3 are covered with either frost or snow that the present modification is designed, and for this reason an opening 4 is formed within thecab, preferably be: tween the windows?) thereof. The tube of the modified device is of substantially the same size and shape as the tube of the preferred form, said tube comprising a cone or body 5' having a cylindrical extension- 6 upon its inner end, said extension being arranged to fit said opening 4, the diverged end of the cone extending forwardly of the locomotive cab as illustrated to advantage in Fig. 6 of the drawings. The inner endof thecone annularly grooved asat 7- to provide for the support of a glasspanel or pane 8 within the extension 6' through which the engineer may look to obtain a clearview of the roadway or track over which the locomotive is' traveling. Said tube 5 is partially closed at its forward end by a hood 9, the purpose of which is obvious. To maintain the pane or panel 8 at a temperature sufficiently high whereby to prevent the accumulation of frost thereon, I provide a heater 10, annular in form, and disposed toencirc'le the said glass upon the interior thereof, said heaterbeing connected to the boiler 2' through the mediumof a pipe 11. If desired, the heater 10 may be swung to one side ofthe frame within which the windows 3 are positioned or into the position. indicated by the dotted lines in Fig. 5, such movement of the heater being .pipe 11' carryin what I claim as new and desire made possible by a jointconnecting the pipe 11' with a second pipe 12, the latter extending into the interior of the boiler. An elbow. pipe section 13 is thi'eaded over one end of the pipe 11, the opposite end of 'the section 13' fitting a band or collar 14' flanged at one end as indicated at 15'. A

braced by the collar or band 14', the enlargement 17 abutting the elbow 13 aforesaid. A second elbow pipe section 18' connects'the pipe 12 with the pipe section 16 from which arrangement it is apparent that the the heater 10 may be pipe section 16 enlarged 'as at 17' is emswung with the e how 13' and collar '14 at an angle to its normal position, this being made possible. by the section 16' and the novel or peculiar arrangement of the collar From the above arrangement of parts,

taken in connection with the accompanying drawings, it will be noted that the heaters 13.and 20 by reason of their disposition beneath the cone or bodyof the device will condition the latter to cause the snow and sleet accumulating therein to melt and flow therefrom; that the heaters 9 and 10 will prevent the accumulation ofmoisture, frost or the like upon the glass or panelof the lock out tube; and that by hinging as indicated at 20, the frame .7 of the device, the.

latter may be opened and closed with re spect to the extension 3 to facilitate cleaning of the glass 8 when soiled.

In reduction to practice, I have found that the form of my invention, illustrated in the drawings and referred to in the abovedescription', as the preferred embodiment, is the most efiicient and practical; yet realizing that the conditions concurrent with the adoption of my device will necessarily vary, I desire to emphasizethe fact that various minor changes in details of construction,

proportion and arrangement of parts may be resorted to, when required, without sacrificing any ofcthe advantages of my invention, as defined in the appended claims.-

, Having thus fully described my invention,

to secure by Letters" Patent, is i 1; An observation tube comprising a body having its lower wall slanting downwardly toward the outer end thereof, a carrying meaett m structure associated with said slanting wall, and a heating agent carried by said structure in proximity to said slanting wall.

, 2. The combination with an adjustably mounted observation tube, having its lower.

wall slanting downwardly to the outer end thereof and having a windowv associated with the inner end thereof, of a carrying structure secured to the under face of said slanting wall, and a heating agent arranged it 

